Discrete-time signal processing
Discrete-time signal processing
Microwave Mobile Communications
Microwave Mobile Communications
Transparent Antenna Solutions for Adaptive Coverage Systems
Wireless Personal Communications: An International Journal
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This paper presents basic short-term angular domain propagation descriptions relevant for beam-oriented SDMA operations, i.e. for spatially based algorithms, contrary to temporally based. A distinction is made between angular variant and invariant situations, i.e. whether the antenna system radiation pattern remains unchanged or not when sweeping over the angular domain. For the angular invariant case, multibeam diversity relations are explained, as well as simple data enhancement techniques for measurement refinements. For the angular variant case using linear arrays, this paper suggests a representation in the invariant virtual Doppler domain. A key benefit of generating beams in the Doppler domain instead of directly in the angular domain is a substantial saving in numerical complexity.